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JavaScript Object Notation (JSON): A text-based, data interchange format that is used to transmit structured data, typically in Asynchronous JavaScript + XML (AJAX) web applications, as described in [RFC4627]. The JSON format is based on the structure of ECMAScript (Jscript, JavaScript) objects.

jitter: A variation in a network delay that is perceived by the receiver of each packet.

job definition: A persistent container that defines and stores instructions for a job to be run on a server, server farm, or server cluster. To run, a job needs to be associated with a job definition, and a job definition needs to be associated with a service or a web application.

job instance: A record that represents a single execution of a job definition on a protocol client.

job lock: A mechanism that helps prevent multiple instances of a job definition from running simultaneously.

Joint Photographic Experts Group (JPEG): A raster graphics file format for displaying high-resolution color graphics. JPEG graphics apply a user-specified compression scheme that can significantly reduce the file sizes of photo-realistic color graphics. A higher level of compression results in lower quality, whereas a lower level of compression results in higher quality. JPEG-format files have a .jpg or .jpeg file name extension.

justify distributed: A special, distributed-alignment setting that evenly distributes the last line of text in a cell. The setting is primarily used for East Asian languages. See also distributed alignment.

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